Factors that Affect Rates of Dissolving and Solubility

The definition of the Rate of Dissolving is:

• How much solute dissolves in a given quantity of solvent

• How quickly a solute dissolves in a solvent

• How fast a solvent dissolves in a solute

• How much solvent dissolves in a given quantity of solvent

Which of the following is NOT a factor that affects the rate of dissolving?

• Temperature

• Agitation

• Pressure

• Increasing surface area

Increasing temperature helps solutes dissolve faster because...

• Solvent molecules have greater kinetic energy

• Solvent molecules have less kinetic energy

• Solvent molecules have greater potential energy

• Solvent molecules have less potential energy

Dissolving is more likely to happen if...

• The energy gained from solute/solvent attractions is greater than the energy used to weaken attractions

• The energy gained from solute/solvent attractions is less than the energy used to weaken attractions

• The solute is a solid

• There is no net energy gain or loss

True or False: There is no difference between solubility and the rate of dissolving.

• True

• False

Polar compounds are more likely to dissolve in...

• Non-polar solvents

• Either non-polar or polar solvents

• Polar solvents

• They don't dissolve

Hydrogen bonding is a special type of:

• Ion-dipole attraction

• Covalent bond

• Ionic bond

• Dipole-dipole attraction

Many covalent compounds do not dissolve in water. Why?

• Water is non-polar, covalent compounds are polar

• Water is polar, covalent compounds are non-polar

• Covalent compounds don't dissolve in anything

• Water is polar, covalent compounds are polar

A good example of a compound that can dissolve in non-polar and polar solvents is...

• Salt

• Ethanol

• Methanol

• Acetic acid

True or False: Large molecules are generally more soluble than smaller molecules

• True

• False